Chapter 1: The Wonderful World of Science

Introduction

Science is all around us! It helps us understand the world we live in and improves our daily life. Everything from the air we breathe to the stars we see in the sky involves science.

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1. What is Science?

• Science is the study of the natural world using observation, experiments, and reasoning.
• It helps us find answers to questions about how things work.
• Science is everywhere: in nature, in technology, in medicine, and in everyday life.

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2. Science in Daily Life

• Science makes our life easier, safer, and healthier.
• Examples:
  • Cooking uses heat and chemical reactions.
  • Electricity and gadgets are based on physics principles.
  • Medicines are made using chemical and biological knowledge.

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3. Branches of Science

Science is divided into several branches to make learning easier:

1. Physics – The study of matter, energy, and forces.
   • Example: Motion, light, heat, sound, magnetism.
2. Chemistry – The study of substances and their changes.
   • Example: Water, acids, cooking reactions.
3. Biology – The study of living things.
   • Example: Plants, animals, human body.
4. Earth Science – The study of Earth, its atmosphere, and space.
   • Example: Rocks, weather, stars, planets.

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4. Importance of Science

• Helps us solve problems in daily life.
• Leads to new inventions like computers, medicines, and transport.
• Enables us to understand nature better and take care of our environment.

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5. How Science Works

Science uses experiments, observations, and reasoning:

1. Observation – Watch carefully and note details.
2. Experimentation – Test ideas to see if they work.
3. Analysis – Study results and find patterns.
4. Conclusion – Understand what the results mean.

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Questions

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1. Very Short Answer (1 mark)

1. What is science?
2. Why is curiosity important in science?
3. What is the first step in the scientific method?
4. Give an example of science from daily life.
5. Why do scientists make hypotheses?
6. Name the planet that supports life.
7. What does a hypothesis mean?
8. Give one example of scientific thinking.
9. What does “observation” mean in science?
10. Name one thing scientists do after experimenting.

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2. Multiple Choice Questions (MCQ)

1. Science is like a
   a) fixed list of facts
   b) giant unending puzzle
   c) secret code
   d) magic trick
2. What happens to water when heated?
   a) becomes ice
   b) becomes steam
   c) evaporates into earth
   d) disappears
3. Which of these is least important in science?
   a) observation
   b) curiosity
   c) memorisation
   d) experimentation
4. Scientists first
   a) make big machines
   b) ask questions
   c) memorise facts
   d) ignore observations
5. Science helps us to
   a) avoid asking questions
   b) understand how the world works
   c) guess randomly
   d) forget about nature

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3. Fill in the Blanks

1. Science is described as a way of __________, observing, and doing.
2. Earth is the only planet known to support __________.
3. When water is cooled it becomes __________.
4. The first and foremost thing to learn science well is to be __________.
5. A (n) __________ is a scientific guess.

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4. True/False Type

1. Science is just about memorising facts. (True/False)
2. A hypothesis is random guessing without any reason. (True/False)
3. Scientists always work alone. (True/False)
4. Observing nature is part of scientific work. (True/False)
5. Science is only about experiments. (True/False)

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5. Short Answer Questions (2–3 marks)

1. Explain in your own words what science is.
2. Describe why curiosity is important for scientists.
3. List any two examples of science from everyday life.
4. How can we use the scientific method to find a solution to a problem?
5. What does “observation” mean in a scientific context?

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6. Long Answer Questions (4–5 marks)

1. Describe the steps of the scientific method with an example from daily life.
2. How is science like a “giant jigsaw puzzle”? Explain.
3. Discuss how science helps us understand the world. Give examples.
4. Why does the chapter say that everyone can think like a scientist? Explain.
5. Explain how curiosity can lead to discoveries and new knowledge. Use real‑life examples.

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7. Higher-Order Thinking (HOT) & Application

1. A light bulb doesn’t glow when switched on. Using the scientific method, write possible reasons and how you would test them.
2. Your pen suddenly stops writing. Describe how you would find the reason using scientific thinking.
3. Explain how studying science helps in understanding the environment around us.

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8. Passage-Based Questions

Read the passage and answer:
Science starts with curiosity. It involves observing something interesting, asking questions, guessing an answer, testing it, and analyzing results.

1. What is the main idea of this passage?
2. Why is testing important?
3. How can you apply this process in school activities?

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Answers

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1. Very Short Answer (1 mark)

1. Science is the study of the natural world using observation, experiments, and reasoning.
2. Curiosity is important because it drives us to ask questions and explore the world.
3. The first step in the scientific method is observation or asking a question.
4. Example: Cooking, using electricity, growing plants, or using a computer.
5. Scientists make hypotheses to make an educated guess about what might happen.
6. Earth
7. A hypothesis is a scientific guess based on observation.
8. Example: Observing how plants grow in sunlight versus shade.
9. Observation means carefully watching or noticing things to gather information.
10. Scientists analyze the results or draw conclusions after experimenting.

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2. Multiple Choice Questions (MCQ)

1. b) giant unending puzzle
2. b) becomes steam
3. c) memorisation
4. b) ask questions
5. b) understand how the world works

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3. Fill in the Blanks

1. thinking
2. life
3. ice
4. curious
5. hypothesis

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4. True/False Type

1. False
2. False
3. False
4. True
5. False

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5. Short Answer Questions (2–3 marks)

1. Science is a way of studying nature using observation, experiments, and reasoning.
2. Curiosity motivates scientists to ask questions and explore new ideas.
3. Examples: boiling water, using magnets, observing plant growth, using a mobile phone.
4. By observing carefully, forming a hypothesis, testing it, and analyzing results, we can solve problems scientifically.
5. Observation means noticing and recording facts and events carefully.

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6. Long Answer Questions (4–5 marks)

1. Steps of the scientific method:
   • Observation → Question → Hypothesis → Experiment → Analysis → Conclusion
     Example: Observing that plants grow faster in sunlight, hypothesizing sunlight helps growth, testing by keeping some plants in shade, and concluding sunlight is important.
2. Science is like a giant jigsaw puzzle because every discovery adds a piece of knowledge, and the more pieces we add, the clearer the picture becomes.
3. Science helps us understand the world through observation, experiments, and reasoning.
   Examples: Electricity, medicines, transportation, weather prediction.
4. Everyone can think like a scientist because science begins with curiosity, asking questions, and observing, which anyone can do.
5. Curiosity leads to new discoveries because it encourages asking questions, testing ideas, and learning from results.
   Example: Observing why the sky is blue or how plants grow faster in certain conditions.

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7. Higher-Order Thinking (HOT) & Application

1. Light bulb doesn’t glow:
   • Possible reasons: bulb is faulty, power is off, wire is loose.
   • Test: check power supply, replace bulb, inspect wiring.
2. Pen stops writing:
   • Possible reasons: ink is empty, nib blocked, cap is closed.
   • Test: check ink, clean nib, open cap, test on paper.
3. Studying science helps understand the environment by explaining natural phenomena, pollution, plants, animals, and weather patterns.

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8. Passage-Based Questions

1. Main idea: Science starts with curiosity and uses observation and experimentation to find answers.
2. Testing is important to confirm whether the hypothesis is correct.
3. Apply by observing experiments, asking questions, and checking results in school projects or daily life.